msm: msm_bus: Fix the number of masters for 8960 Pro

The video core master IDs on 8064 Pro are higher than
the ID values for 8960. This patch changes the max
allowed ID value to the correct number.

Change-Id: I286023c362df27272d109a822e32df6673e637ab
Signed-off-by: Gagan Mac <gmac@codeaurora.org>